HEAT OF NEUTRALIZATION

APPARATUS

-THERMOMETER


-STYROFOAM CUPS


-50 mL GRADUATED CYLINDER


-SQUARE CARDBOARD WITH HOLE IN CENTER.


-SPLIT ONE-HOLE STOPPER


-250 mL BEAKERS


-400mL BEAKER


-HOT PLATE

CHEMICALS

1 M HCL

I M HC2H3O2 (ACETIC ACID

1 M NaOH

OBJECTIVES

This activity requires your team to construct the calorimeter, determine heat capacity of a calorimeter
and measure the heat changes accompanying neutralization for weak and strong acids with base.
You
are provided with a diagram of simple calorimeter (Figure 1).

PROCEDURE

Part C: Heat of Neutralization of HC2H3O2 – NaOH


  1. Repeat the procedure in Part B. Use 1 M HC2H3O2 (acetic acid) instead of 1 M HCl.

Part A: Heat Capacity of Calorimeter


  1. Construct a calorimeter similar to the one shown in Figure 1 by nesting two styrofoam


    cups together.


  2. Place a thermometer into the hole in the cardboard square and stabilize it by a split


    one-hole rubber stopper.


  3. Place exactly 50.0 mL of tap water in the calorimeter cup. Allow the system for 10


    minutes to reach thermal equilibrium. Record the temperature (to nearest 0.1°C).




  1. Place exactly 50.0 mL of hot tap water in a 250-mL beaker. Heat the water until the


    temperature is about 15°C – 20°C above room temperature.


  2. Record the temperature of the hot water.


  3. Pour the hot water into the calorimeter.


  4. Replace the lid of the calorimeter and stir the water carefully with the thermometer.


  5. Record the temperature of the water every 5 seconds for first 3 readings and every 15


    seconds for next 2 minutes.


  6. Construct a graph of temperature as a function of time


Part B: Heat of Neutralization of HCl – NaOH


  1. Dry the calorimeter and the thermometer with a towel. Measure 50.0 mL of 1.0 M


    NaOH and add it to the calorimeter.


  2. Replace the lid of the calorimeter without the thermometer.


  3. Measure exactly 50.0 mL of 1.0 M HCl into a dry beaker. Allow it to stand near the


    calorimeter for 4 minutes.


  4. Record the temperature of the acid.


  5. Rinse the thermometer with tap water and wipe till it dry.


  6. Record the temperature of the base solution.


  7. Add the HCl to the NaOH.


  8. Stir the solution carefully and the record temperature every 15 seconds.


  9. Construct a graph of temperature as a function of time.

SAFETY PRECAUTION

Do not stir the liquid in the calorimeter vigorously because vigorous stirring does cause some increase in temperature.

Potect our bodies from chemical spills by wearing Personal Protective equipment (PPE).

Wear latex glove every time when you do the experiment.

wearing mask to avoid from vapour gases

Wash your hand befire leaving lab to avoid poisoning.

MOHAMAD IMAN HAIKAL BIN CHE NOR SALAHUDDIN


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